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• OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error

  28 septembre 2016, par user2262504

  I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out.

  It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec ’libx264’" error.

  Anyone has ideas to solve this problem ?

  More specifically :

  1. anyone knows where and how OpenCV invoke ffmpeg API ?
  2. how to change ffmpeg default settings using code, hopefull, can be easily embeded into OpenCV ?
  3. will changes of default in ffmpeg be carried to libx264 ?

  Errors :

  1. Uising CV_FOURCC('H', '2', '6', '4')
  
  [libx264 @ 0x255de40] broken ffmpeg default settings detected
  
  [libx264 @ 0x255de40] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x255de40] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x255de40] speed presets are listed in x264 --help
  
  [libx264 @ 0x255de40] profile is optional; x264 defaults to high
  
  Could not open codec 'libx264': Unspecified error
  
  
  
  2. Using FOURCC = -1 to invoke user customized codec
  
  OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv 
  
  backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, 
  
  file /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, 
  
  line 505 terminate called after throwing an instance of 'cv::Exception'
  
  what():  /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp:
  
  505: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally.
  
  in function CvVideoWriter_GStreamer::open
  
  </profile></speed>

  Codes :

  int main(int argc, char *argv[])
  
  {
  
      VideoWriter outputVideo;
  
      bool fourcc_on = true; //switch on / off different error
  
      if (fourcc_on)
  
          outputVideo.open("outVideo.avi", CV_FOURCC('H', '2', '6', '4'), 25, Size(100, 100), true);
  
      else
  
          outputVideo.open("outVideo.avi", -1, 25, Size(100, 100), true);
  
  
  
      if (!outputVideo.isOpened())
  
      {
  
          cout  << "Could not open the output video for write" << endl;
  
          return -1;
  
      }
  
      return 0;
  
  }

  OpenCV Configuration :

  -- Detected version of GNU GCC: 46 (406)
  
  -- Found OpenEXR: /usr/lib/libIlmImf.so
  
  -- Looking for linux/videodev.h
  
  -- Looking for linux/videodev.h - not found
  
  -- Looking for linux/videodev2.h
  
  -- Looking for linux/videodev2.h - found
  
  -- Looking for sys/videoio.h
  
  -- Looking for sys/videoio.h - not found
  
  -- Looking for libavformat/avformat.h
  
  -- Looking for libavformat/avformat.h - found
  
  -- Looking for ffmpeg/avformat.h
  
  -- Looking for ffmpeg/avformat.h - not found
  
  -- Could NOT find JNI (missing:  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
  
  -- 
  
  -- General configuration for OpenCV 2.4.8 =====================================
  
  --   Version control:               unknown
  
  -- 
  
  --   Platform:
  
  --     Host:                        Linux 3.8.0-38-generic x86_64
  
  --     CMake:                       2.8.7
  
  --     CMake generator:             Unix Makefiles
  
  --     CMake build tool:            /usr/bin/make
  
  --     Configuration:               RELEASE
  
  -- 
  
  --   C/C++:
  
  --     Built as dynamic libs?:      YES
  
  --     C++ Compiler:                /usr/bin/c++  (ver 4.6)
  
  --     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
  
  --     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
  
  --     C Compiler:                  /usr/bin/gcc
  
  --     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG  -DNDEBUG
  
  --     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG
  
  --     Linker flags (Release):      
  
  --     Linker flags (Debug):        
  
  --     Precompiled headers:         YES
  
  -- 
  
  --   OpenCV modules:
  
  --     To be built:                 core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib python stitching superres ts videostab
  
  --     Disabled:                    world
  
  --     Disabled by dependency:      -
  
  --     Unavailable:                 androidcamera dynamicuda java
  
  -- 
  
  --   GUI: 
  
  --     QT:                          NO
  
  --     GTK+ 2.x:                    YES (ver 2.24.10)
  
  --     GThread :                    YES (ver 2.32.4)
  
  --     GtkGlExt:                    NO
  
  --     OpenGL support:              NO
  
  -- 
  
  --   Media I/O: 
  
  --     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4)
  
  --     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
  
  --     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46)
  
  --     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5)
  
  --     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
  
  --     OpenEXR:                     /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1)
  
  -- 
  
  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  YES (ver 2.2.0)
  
  --     FFMPEG:                      YES
  
  --       codec:                     YES (ver 55.58.105)
  
  --       format:                    YES (ver 55.37.101)
  
  --       util:                      YES (ver 52.78.100)
  
  --       swscale:                   YES (ver 2.6.100)
  
  --       gentoo-style:              YES
  
  --     GStreamer:                   
  
  --       base:                      YES (ver 0.10.36)
  
  --       app:                       YES (ver 0.10.36)
  
  --       video:                     YES (ver 0.10.36)
  
  --     OpenNI:                      NO
  
  --     OpenNI PrimeSensor Modules:  NO
  
  --     PvAPI:                       NO
  
  --     GigEVisionSDK:               NO
  
  --     UniCap:                      NO
  
  --     UniCap ucil:                 NO
  
  --     V4L/V4L2:                    Using libv4l (ver 1.0.1)
  
  --     XIMEA:                       NO
  
  --     Xine:                        NO
  
  -- 
  
  --   Other third-party libraries:
  
  --     Use IPP:                     NO
  
  --     Use Eigen:                   NO
  
  --     Use TBB:                     NO
  
  --     Use OpenMP:                  NO
  
  --     Use GCD                      NO
  
  --     Use Concurrency              NO
  
  --     Use C=:                      NO
  
  --     Use Cuda:                    NO
  
  --     Use OpenCL:                  YES
  
  -- 
  
  --   OpenCL:
  
  --     Version:                     dynamic
  
  --     Include path:                /home/shixudongleo/Downloads/opencv-2.4.8/3rdparty/include/opencl/1.2
  
  --     Use AMD FFT:                 NO
  
  --     Use AMD BLAS:                NO
  
  -- 
  
  --   Python:
  
  --     Interpreter:                 /usr/bin/python (ver 2.7.3)
  
  --     Libraries:                   /usr/lib/libpython2.7.so
  
  --     numpy:                       /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1)
  
  --     packages path:               lib/python2.7/dist-packages
  
  -- 
  
  --   Java:
  
  --     ant:                         NO
  
  --     JNI:                         NO
  
  --     Java tests:                  NO
  
  -- 
  
  --   Documentation:
  
  --     Build Documentation:         NO
  
  --     Sphinx:                      NO
  
  --     PdfLaTeX compiler:           /usr/bin/pdflatex
  
  -- 
  
  --   Tests and samples:
  
  --     Tests:                       YES
  
  --     Performance tests:           YES
  
  --     C/C++ Examples:              NO
  
  -- 
  
  --   Install path:                  /usr/local
  
  -- 
  
  --   cvconfig.h is in:              /home/shixudongleo/Downloads/opencv-2.4.8/build
  
  -- -----------------------------------------------------------------
  
  -- 
  
  -- Configuring done
  
  -- Generating done
  
  -- Build files have been written to: /home/XXX/Downloads/opencv-2.4.8/build

  FFMPEG

  ffmpeg is enable to support OpenCV and libx264 is enabled when compiling ffmpeg.
  By using ffmpeg command line, libx264 is running normally.

  $ ffmpeg -i test.avi -vcodec libx264 test.mp4
  
  ffmpeg -i test.avi -vcodec libx264 test.mp4 > ~/Downloads/ffmpeg_log.txt
  
  ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 24 2014 16:39:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic
  
    libavutil      52. 78.100 / 52. 78.100
  
    libavcodec     55. 58.105 / 55. 58.105
  
    libavformat    55. 37.101 / 55. 37.101
  
    libavdevice    55. 13.100 / 55. 13.100
  
    libavfilter     4.  4.100 /  4.  4.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, avi, from 'test.avi':
  
    Duration: 00:00:03.73, start: 0.000000, bitrate: 1757 kb/s
  
      Stream #0:0: Video: msvideo1 (CRAM / 0x4D415243), rgb555le, 320x240, 1781 kb/s, 15 tbr, 15 tbn, 15 tbc
  
      Metadata:
  
        title           : julius.avi Video #1
  
  File 'test.mp4' already exists. Overwrite ? [y/N] y
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0x25d08e0] using cpu capabilities: none!
  
  [libx264 @ 0x25d08e0] profile High 4:4:4 Predictive, level 1.2, 4:4:4 8-bit
  
  [libx264 @ 0x25d08e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf55.37.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 320x240, q=-1--1, 15360 tbn, 15 tbc
  
      Metadata:
  
        title           : julius.avi Video #1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (msvideo1 -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=   56 fps=0.0 q=-1.0 Lsize=     321kB time=00:00:03.60 bitrate= 731.0kbits/s    
  
  video:320kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.409949%
  
  [libx264 @ 0x25d08e0] frame I:3     Avg QP:15.36  size:  7975
  
  [libx264 @ 0x25d08e0] frame P:38    Avg QP:26.05  size:  6230
  
  [libx264 @ 0x25d08e0] frame B:15    Avg QP:28.25  size:  4418
  
  [libx264 @ 0x25d08e0] consecutive B-frames: 46.4% 53.6%  0.0%  0.0%
  
  [libx264 @ 0x25d08e0] mb I  I16..4:  1.4% 72.8% 25.8%
  
  [libx264 @ 0x25d08e0] mb P  I16..4:  1.6%  5.7% 15.1%  P16..4:  7.6%  6.3%  7.4%  0.0%  0.0%    skip:56.3%
  
  [libx264 @ 0x25d08e0] mb B  I16..4:  0.2%  1.0%  2.0%  B16..8: 13.3%  7.8%  8.7%  direct: 8.3%  skip:58.8%  L0:34.9% L1:36.6% BI:28.5%
  
  [libx264 @ 0x25d08e0] 8x8 transform intra:37.7% inter:2.3%
  
  [libx264 @ 0x25d08e0] coded y,u,v intra: 52.1% 42.1% 30.1% inter: 19.6% 9.2% 5.2%
  
  [libx264 @ 0x25d08e0] i16 v,h,dc,p: 56% 17% 24%  2%
  
  [libx264 @ 0x25d08e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 16% 68%  1%  1%  1%  1%  1%  1%
  
  [libx264 @ 0x25d08e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 28%  5%  6%  5%  7%  5%  6%
  
  [libx264 @ 0x25d08e0] Weighted P-Frames: Y:31.6% UV:21.1%
  
  [libx264 @ 0x25d08e0] ref P L0: 70.5%  9.0% 12.1%  6.5%  2.0%
  
  [libx264 @ 0x25d08e0] ref B L0: 91.3%  8.7%
  
  [libx264 @ 0x25d08e0] kb/s:700.56

• How to generate a variable framerate MPEG-4 from a bunch of images and an audio file ?

  11 avril 2014, par Michael Kohout

  I've got a series of images captured by a motion sensor camera-right now, I'm doing a bit of processing on them and each image is stored as a bunch of PNM/PBM files (but I do have a unix timestamp of when they were first created). I've also got an audio file (where I know the starting time), recorded over the same period.

  Is there any way I can construct a MPEG-4 from these images and have them display at the appropriate time so they'll be sync'd with the audio ?

  Is this something ffmpeg should be able to do ?

• Virtual host compared to multiple servers

  9 septembre 2011, par josiecat

  This may be dumb but has me wondering why and I know how to setup the virtual host but need to know the why or what it is good for.

  Why do you setup virtual host for local development and why not just put sub directories ?

  What are the real world uses and how do you use virtual host ?

  (my normal set up as of now)
  I use Mamp and just put more folders (speaking dummy terms here) in the htdocs folder. Is that ok what am I missing ?

  The reason why I would like to use virtual hosting is because I would like to have a few servers to try different technologies (e.g. adding ffmpeg support for streaming video and many others ) but do I use virtual hosting to be able to have more than one server or do I need to use something like virtual machine to have multiple servers with different versions of PHP, Mysql etc...?

  I understand how to set this stuff up just don't understand the difference from virtual host to multiple servers ? could I actually set up one with php just the basic and another for php with ffmpeg-php and other stuff like zend or what ever just to have different server environments to basically mock the actual server that the project will land when done ?